Shareholders' Equity (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) installment Plan shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Apr. 26, 2001 shares
Number of equity incentive plans | Plan	3
Share-based compensation, number of shares available for future grants (in shares) | shares	386,754
Stock option expiration period	10 years
Stock compensation expense	$ 657,000	$ 570,000	$ 580,000
Unrecognized expense related to restricted stock and cash entitlements	1,983,000	1,774,000	1,542,000
Stock compensation expense, net of tax	$ 1,157,000	$ 1,195,000	$ 928,000
Common stock, authorized shares repurchase (in shares) | shares				911,631
Total shares repurchased (in shares) | shares	502,447
Common stock, shares repurchased (in shares) | shares	0	0	0
Bank
Retained earnings available for payment of dividends to parent company without prior regulatory approval	$ 64,000,000
Nonqualified Stock Options
Stock option expiration period	20 years
Employee Stock Option
Number of options granted (in shares) | shares	0	0	0
Stock compensation expense	$ 0	$ 0	$ 0
Restricted Stock
Restricted stock as a percent of grant	60.00%
Cash credit entitlements as a percent of grant	40.00%
Number of installments | installment	3
Restricted stock vesting percentage upon satisfaction of service requirement	100.00%
Restricted Stock | Year One
Percentage vested	33.30%
Restricted Stock | Year Two
Percentage vested	33.30%
Restricted Stock | Year Three
Percentage vested	33.30%
Employee Stock Purchase Plan
Share-based compensation, number of shares available for future grants (in shares) | shares	557,203
Stock compensation expense	$ 32,000	82,000	22,000
Unrecognized expense related to restricted stock and cash entitlements	$ 0	0	0
Share-based compensation arrangement, purchase price discount from fair market value	95.00%
Share-based compensation arrangement, number of shares authorized (in shares) | shares	750,000
Stock compensation expense, net of tax	$ 19,000	$ 50,000	$ 13,000